401(k) Calculator
Quick answer
Enter age window, salary, contribution dollars or percent, match rules, and growth assumptions. Compare outcomes when you increase contributions to the match cap.
For a related estimate, see Compound Interest Calculator.
Explore further: Future Value Calculator · Gdp Calculator
Why match matters
Match is immediate return on contributions up to the rule — missing it is often worse than chasing a slightly higher fund return.
Explore further: Investment Calculator · Ira Calculator
A 401(k) combines contributions, possible employer match, tax deferral, and investment growth. Modeling match capture and raise paths shows whether you are leaving money on the table.
How to use this calculator
- Encode match tiers: Match formulas differ — percent of deferral vs percent of pay caps at different levels.
- Layer vesting mentally: Unvested match may not be yours if you leave early — adjust expectations if needed.
- Revisit annually: Raises and IRS limit changes should trigger a quick refresh.
Real-world examples
- Example: full match: Deferring 6% with a 50% match on the first 6% effectively adds a 3%-of-pay boost if fully vested — structure varies.
- Sensitivity check: Nudge the rate by about +0.5% and the principal by about −5%. If the payment, break-even, or target amount moves enough to change your decision, you are still on a steep part of the curve where small inputs matter.
Explore further: Savings Rate Calculator
Practical read
If projections look short, raise deferrals before assuming higher returns — deferrals are more controllable.
FAQ
Are growth projections guaranteed?
No. Returns are uncertain; use ranges and stress tests rather than a single optimistic path.
Should I compare pre-tax and Roth using the same return?
You can, but spendable dollars differ at withdrawal — tax location matters for net outcomes.
How accurate is this calculator?
It applies standard math to the inputs you enter. Real lenders, payroll rules, and rounding can differ—use results for planning and comparison, not as binding quotes.